I know the versioning of toolchains is rather `magical`, but here's what I suggest:

```python
version = '1.5.10'
```
Reasoning: `goolf-1.4.10` and `gompi-1.4.10` feature `GCC-4.7.2` and `OpenMPI-1.6.4`

If `goalf-1.5.10` features `GCC-4.8.1` and `OpenMPI-1.6.5`, that more or less matches that scheme.

The reason for the `.10` BTW is just because that gives us the freedom to downgrade one or multiple dependency versions if the need arises.

`goalf-1.1.0(-no-OFED)` was our very first (public, non-ictce) toolchain, and thus we just picked `.0` without really thinking about it; using a significantly higher last number gives you a lot more freedom